USN-4591-1: Linux kernel vulnerabilities

Releases

• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM

Packages

• linux - Linux kernel
• linux-hwe - Linux hardware enablement (HWE) kernel
• linux-hwe-5.4 - Linux hardware enablement (HWE) kernel
• linux-oem - Linux kernel for OEM systems
• linux-raspi - Linux kernel for Raspberry Pi (V8) systems
• linux-raspi-5.4 - Linux kernel for Raspberry Pi (V8) systems
• linux-snapdragon - Linux kernel for Qualcomm Snapdragon processors

Details

Andy Nguyen discovered that the Bluetooth L2CAP implementation in the Linux
kernel contained a type-confusion error. A physically proximate remote
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2020-12351)

Andy Nguyen discovered that the Bluetooth A2MP implementation in the Linux
kernel did not properly initialize memory in some situations. A physically
proximate remote attacker could use this to expose sensitive information
(kernel memory). (CVE-2020-12352)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 20.04

• linux-image-5.4.0-1022-raspi - 5.4.0-1022.25
• linux-image-5.4.0-52-generic - 5.4.0-52.57
• linux-image-5.4.0-52-generic-lpae - 5.4.0-52.57
• linux-image-5.4.0-52-lowlatency - 5.4.0-52.57
• linux-image-generic - 5.4.0.52.55
• linux-image-generic-hwe-18.04 - 5.4.0.52.55
• linux-image-generic-hwe-18.04-edge - 5.4.0.52.55
• linux-image-generic-hwe-20.04 - 5.4.0.52.55
• linux-image-generic-lpae - 5.4.0.52.55
• linux-image-generic-lpae-hwe-18.04 - 5.4.0.52.55
• linux-image-generic-lpae-hwe-18.04-edge - 5.4.0.52.55
• linux-image-generic-lpae-hwe-20.04 - 5.4.0.52.55
• linux-image-lowlatency - 5.4.0.52.55
• linux-image-lowlatency-hwe-18.04 - 5.4.0.52.55
• linux-image-lowlatency-hwe-18.04-edge - 5.4.0.52.55
• linux-image-lowlatency-hwe-20.04 - 5.4.0.52.55
• linux-image-oem - 5.4.0.52.55
• linux-image-oem-osp1 - 5.4.0.52.55
• linux-image-raspi - 5.4.0.1022.57
• linux-image-raspi-hwe-18.04 - 5.4.0.1022.57
• linux-image-raspi-hwe-18.04-edge - 5.4.0.1022.57
• linux-image-raspi2 - 5.4.0.1022.57
• linux-image-raspi2-hwe-18.04 - 5.4.0.1022.57
• linux-image-raspi2-hwe-18.04-edge - 5.4.0.1022.57
• linux-image-virtual - 5.4.0.52.55
• linux-image-virtual-hwe-18.04 - 5.4.0.52.55
• linux-image-virtual-hwe-18.04-edge - 5.4.0.52.55
• linux-image-virtual-hwe-20.04 - 5.4.0.52.55

Ubuntu 18.04

• linux-image-4.15.0-1090-snapdragon - 4.15.0-1090.99
• linux-image-4.15.0-1100-oem - 4.15.0-1100.110
• linux-image-4.15.0-122-generic - 4.15.0-122.124
• linux-image-4.15.0-122-generic-lpae - 4.15.0-122.124
• linux-image-4.15.0-122-lowlatency - 4.15.0-122.124
• linux-image-5.4.0-1022-raspi - 5.4.0-1022.25~18.04.1
• linux-image-5.4.0-52-generic - 5.4.0-52.57~18.04.1
• linux-image-5.4.0-52-generic-lpae - 5.4.0-52.57~18.04.1
• linux-image-5.4.0-52-lowlatency - 5.4.0-52.57~18.04.1
• linux-image-generic - 4.15.0.122.109
• linux-image-generic-hwe-18.04 - 5.4.0.52.57~18.04.46
• linux-image-generic-lpae - 4.15.0.122.109
• linux-image-generic-lpae-hwe-18.04 - 5.4.0.52.57~18.04.46
• linux-image-lowlatency - 4.15.0.122.109
• linux-image-lowlatency-hwe-18.04 - 5.4.0.52.57~18.04.46
• linux-image-oem - 4.15.0.1100.104
• linux-image-raspi-hwe-18.04 - 5.4.0.1022.26
• linux-image-snapdragon - 4.15.0.1090.93
• linux-image-snapdragon-hwe-18.04 - 5.4.0.52.57~18.04.46
• linux-image-virtual - 4.15.0.122.109
• linux-image-virtual-hwe-18.04 - 5.4.0.52.57~18.04.46

Ubuntu 16.04

• linux-image-4.15.0-122-generic - 4.15.0-122.124~16.04.1
• linux-image-4.15.0-122-generic-lpae - 4.15.0-122.124~16.04.1
• linux-image-4.15.0-122-lowlatency - 4.15.0-122.124~16.04.1
• linux-image-generic-hwe-16.04 - 4.15.0.122.122
• linux-image-generic-hwe-16.04-edge - 4.15.0.122.122
• linux-image-generic-lpae-hwe-16.04 - 4.15.0.122.122
• linux-image-generic-lpae-hwe-16.04-edge - 4.15.0.122.122
• linux-image-lowlatency-hwe-16.04 - 4.15.0.122.122
• linux-image-lowlatency-hwe-16.04-edge - 4.15.0.122.122
• linux-image-oem - 4.15.0.122.122
• linux-image-virtual-hwe-16.04 - 4.15.0.122.122
• linux-image-virtual-hwe-16.04-edge - 4.15.0.122.122

After a standard system update you need to reboot your computer to make
all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.

References

• CVE-2020-12352
• CVE-2020-12351

Related notices

• USN-4592-1: linux-image-5.0.0-1070-oem-osp1, linux-image-raspi2-hwe-18.04, linux-image-oem-osp1, linux-image-5.3.0-1036-raspi2, linux-oem-osp1, linux-raspi2-5.3
• USN-4657-1: linux-image-powerpc64-smp-lts-xenial, linux-image-4.4.0-197-powerpc64-emb, linux-image-powerpc64-emb-lts-wily, linux-image-powerpc64-emb, linux-image-generic-lpae-lts-xenial, linux-image-powerpc64-smp-lts-wily, linux-image-powerpc64-smp-lts-utopic, linux-kvm, linux-image-powerpc-e500mc, linux-snapdragon, linux-image-generic-lpae, linux-image-powerpc64-smp, linux-image-powerpc64-emb-lts-utopic, linux-image-generic-lts-vivid, linux-image-virtual, linux-image-generic-lpae-lts-utopic, linux-image-virtual-lts-xenial, linux-image-snapdragon, linux-image-powerpc64-emb-lts-vivid, linux-image-generic-lts-xenial, linux-image-aws, linux-image-generic-lpae-lts-vivid, linux-image-lowlatency-lts-wily, linux-image-generic-lpae-lts-wily, linux-image-powerpc-e500mc-lts-xenial, linux-image-raspi2, linux-image-4.4.0-197-powerpc-smp, linux-image-virtual-lts-utopic, linux-image-kvm, linux-image-4.4.0-197-powerpc-e500mc, linux-image-lowlatency-lts-vivid, linux-image-powerpc-smp-lts-vivid, linux-raspi2, linux-image-generic-lts-utopic, linux-image-virtual-lts-vivid, linux-image-4.4.0-197-powerpc64-smp, linux-image-generic-lts-wily, linux-image-4.4.0-1084-kvm, linux-image-powerpc64-emb-lts-xenial, linux-image-powerpc-smp, linux-image-lowlatency, linux, linux-image-4.4.0-1082-aws, linux-image-powerpc-e500mc-lts-vivid, linux-image-powerpc64-smp-lts-vivid, linux-image-powerpc-smp-lts-xenial, linux-image-4.4.0-197-generic-lpae, linux-image-4.4.0-1146-snapdragon, linux-image-lowlatency-lts-xenial, linux-image-4.4.0-1142-raspi2, linux-image-virtual-lts-wily, linux-image-powerpc-e500mc-lts-utopic, linux-image-powerpc-smp-lts-utopic, linux-lts-xenial, linux-image-powerpc-smp-lts-wily, linux-image-generic, linux-image-4.4.0-197-lowlatency, linux-image-lowlatency-lts-utopic, linux-image-4.4.0-1118-aws, linux-image-4.4.0-197-generic, linux-image-powerpc-e500mc-lts-wily, linux-aws
• LSN-0073-1: generic-4.15, gcp, lowlatency-4.15, generic-5.4, aws, lowlatency-5.4, oem, azure
• LSN-0074-1: lowlatency-4.4, lowlatency-5.4, generic-4.15, gke, gkeop, gkeop-5.4, fips, gcp, generic-4.4, aws-fips, lowlatency-4.15, generic-5.4, aws, azure-fips, oem, azure